linux-kernel - Re: [linux-pm] [PATCH 2/4] thermal: Add generic cpufreq cooling implementation

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Message-ID: <CAMHCuPUQSPgt8mP2FY7hxi8345ZbLYi9NNbo5P24CDpZp50=_A@mail.gmail.com>
Date:	Tue, 13 Mar 2012 15:44:57 +0530
From:	Sundar <sunder.svit@...il.com>
To:	Amit Kucheria <amit.kucheria@...aro.org>
Cc:	Amit Kachhap <amit.kachhap@...aro.org>, len.brown@...el.com,
	linaro-dev@...ts.linaro.org, patches@...aro.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	mark.gross@...el.com, linux-pm@...ts.linux-foundation.org
Subject: Re: [linux-pm] [PATCH 2/4] thermal: Add generic cpufreq cooling implementation

On Tue, Mar 13, 2012 at 3:30 PM, Amit Kucheria <amit.kucheria@...aro.org> wrote:
> Sundar,

Hi Amit,

> At the moment it doesn't. But there was some discussion around
> creating something that will work with devfreq. This would allow
> peripheral drivers to be plugged in as well. Amit is investigating
> that at present.

What if we work towards a generic constraint framework which models
thermals as a performance constraint.

Drivers can register to this constraint; platform code can then decide
to issue restrictions either to the CPU or other power-hungry
peripherals based on the platform conditions.

That also allows to model CPU frequency as a generic constraint but
via an actual consumer, say the thermal driver.

Cheers!

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